How to stop a single animation without access to it?

I have this code that if worked properly, should let a character have a new animation if pressed w, and it works, until you stop pressing w and then press it again, because the part of the script responsible for stopping the animation has no access to the animation being played, any way around this? Heres the script

local UIS = game:GetService("UserInputService")
local Player = game.Players.LocalPlayer
local Character = Player.Character
Tool = script.Parent
local PlayAnim

Tool.Equipped:Connect(function(mouse)
    dog = true
end)    


UIS.InputBegan:connect(function(input)
    if dog == true then
    if input.KeyCode == Enum.KeyCode.W then
        local Anim = Instance.new("Animation")
        Anim.AnimationId = "rbxassetid://3266940909"
        PlayAnim = Player.Character.Humanoid:LoadAnimation(Anim)
        PlayAnim:Play()
    end
    end
    end)

UIS.InputEnded:connect(function(input)
    if input.KeyCode == Enum.KeyCode.W then
        local AnimationTracks = Player.Character:FindFirstChild("Humanoid"):GetPlayingAnimationTracks()
local bot = AnimationTracks("Anim")
    bot:Stop()
end
        wait(0.001)
        dog = false
end)